BONATSOS, D.; DASKALOYANNIS, C.; KOLOKOTRONIS, P. Symmetries of Anisotropic Harmonic Oscillators with Rational Ratios of Frequencies and their Relations to U(N) and O(N+1). HNPS Advances in Nuclear Physics, [S. l.], v. 7, p. 18–37, 2019. DOI: 10.12681/hnps.2394. Disponível em: https://eproceedings.epublishing.ekt.gr/index.php/hnps/article/view/2394. Acesso em: 7 may. 2024.